Stronger token encryption?

I noticed that version 2.0 is using MD5 with the app token for authentication. It's actually very easy for today's hardware to break MD5 -- either by reverse engineering it, or by creating a key that looks like it. Just google for "MD5 security risk" to see the results.

Using HMAC-SHA512 or another SHA-2 based algorithm would provide much better security -- any chance of an upgrade?